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Voice over Internet Protocol is an upcoming technology that enables voice communication through the Internet. The transmission of audio data over packet switched networks faces lot of difficulties by a variety of network impairments such as packet loss, delay, echo, network security and throughput. This paper focuses on packet loss which is a crucial problem to be addressed. A sender and receiver based repair technique is proposed to overcome the difficulties faced by VoIP. This paper also proposes an evaluation of speech quality by applying improved Packet Loss Concealment (PLC) algorithms with an end-to-end bidirectional transmission control scheme.
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